ls xargs rm

I keep forgetting the proper xargs arguments when I need them.
My intention today was to list old backup files based on the year time stamp and remove them.
Here is the one liner that works specifically because I have named my backups with the dd-mm-yyyy convention:

[root@webserver1 httpd]# ls -latf|grep 2009|xargs -L 1 rm

Here is a better approach that is independent from the file naming convention: